#3676: realToFrac doesn't sanely convert between floating types
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Reporter: draconx | Owner: simonmar
Type: bug | Status: assigned
Priority: normal | Milestone: 6.12.2
Component: libraries (other) | Version: 6.12.1
Keywords: | Difficulty:
Os: Unknown/Multiple | Testcase:
Architecture: x86_64 (amd64) | Failure: None/Unknown
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Comment(by draconx):
While it presumably goes against the report, I personally feel that
floating point types do not belong as members of the Real class *at all*.
The same is true for a number of other classes that they belong to.
In the altfloat package, where I've been experimenting with solutions to
this and other problems, I used a class
{{{
class FloatConvert a b where
toFloating :: a -> b
}}}
which provides the necessary conversions: both between floating point
types, and from real types to floating point types. It should be noted
that the functions `double2Float#` and `float2Double#` in GHC.Exts perform
correct conversion.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3676#comment:11>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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